よどみ流れ中における高密度炭素ならびに炭素/炭素複合材の燃焼(熱工学,内燃機関,動力など)
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概要
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Carbon combustion has been studied in the stagnation flow field, which can be specified uniquely by the velocity gradient. Use has been made of a rod of high-density graphite and/or carbon/carboncomposite as a test specimen. It has succeeded in conducting combustion experiments under conditions with high velocity gradients, up to 6000s^<-1>. It is observed even for the high-density graphite that the combustion rate increases monotonically and reaches the diffusion-limited value with increasing surface temperature at high velocity gradients, while there appears a discontinuous change in the combustion rate, related to the establishment of CO flame, at relatively low velocity gradients. It is also observed that the combustion rate is nearly independent of graphite density, which can even hold for the carbon/carbon-composite. In addition, a discontinuous change in the combustion rate can even be observed for the carbon/carbon-composite when the velocity gradient is relatively low. As for the effect of air flow temperature, it is found that the combustion rate in high-temperature airflow is suppressed, compared to that in room-temperature air flow, because of a reduced mass transfer rate through the thickened boundary layer, when the velocity gradient is the same. Theoretical works have also been conducted and it has been found that the "Frozen" mode without CO flame and the "Flame sheet" mode with infinitely fast gas-phase reaction can fairly represent combustion behavior before and after the establishment of the CO flame, respectively, as far as the trend and the approximate magnitude are concerned. Since the high-density graphite and/or carbon/carbon-composite are expected to be used as heat-shielding structural materials in various aerospace applications, knowledge for their combustion mechanisms is considered to give useful information in preventing their oxidation at high temperatures.
- 社団法人日本機械学会の論文
- 2006-12-25
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